Lỗi AndroidRuntime﹕ FATAL EXCEPTION: trong lập trình Android

Xin mọi người giúp em giải quyết lỗi này với ạ.

Đây kà lỗi ạ:smile:

12-27 13:57:20.060 14291-14291/hn.bk.nguyenbaongoc.trangngoc E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: hn.bk.nguyenbaongoc.trangngoc, PID: 14291
java.lang.OutOfMemoryError
at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)
at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:587)
at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:422)
at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:840)
at android.content.res.Resources.loadDrawable(Resources.java:2192)
at android.content.res.Resources.loadDrawable(Resources.java:2075)
at android.content.res.TypedArray.getDrawable(TypedArray.java:602)
at android.widget.ImageView.(ImageView.java:129)
at android.widget.ImageButton.(ImageButton.java:87)
at android.support.v7.widget.AppCompatImageButton.(AppCompatImageButton.java:59)
at android.support.v7.widget.AppCompatImageButton.(AppCompatImageButton.java:55)
at android.support.v7.app.AppCompatViewInflater.createView(AppCompatViewInflater.java:107)
at android.support.v7.app.AppCompatDelegateImplV7.createView(AppCompatDelegateImplV7.java:938)
at android.support.v7.app.AppCompatDelegateImplV7.onCreateView(AppCompatDelegateImplV7.java:992)
at android.support.v4.view.LayoutInflaterCompatHC$FactoryWrapperHC.onCreateView(LayoutInflaterCompatHC.java:44)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:684)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:755)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:758)
at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:256)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:109)
at hn.bk.nguyenbaongoc.trangngoc.MainActivity.onCreate(MainActivity.java:17)
at android.app.Activity.performCreate(Activity.java:5411)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2270)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2396)
at android.app.ActivityThread.access$800(ActivityThread.java:139)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1293)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:149)
at android.app.ActivityThread.main(ActivityThread.java:5257)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:609)
at dalvik.system.NativeStart.main(Native Method)

Đây là layout của em ạ:

<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <TextView
        android:id="@+id/hienThi"
        android:layout_width="280dp"
        android:layout_height="100dp"
        android:padding="8dp"
        android:text=""
        android:textSize="60sp" />

    <ImageButton
        android:id="@+id/imageButton"
        android:layout_width="80dp"
        android:layout_height="100dp"
        android:onClick="xoa"
        android:scaleType="centerCrop"
        android:src="@drawable/xoa1" />

</LinearLayout>


<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <ImageButton
        android:layout_width="90dp"
        android:layout_height="100dp"
        android:onClick="button1"
        android:scaleType="centerCrop"
        android:src="@drawable/so1" />

    <ImageButton
        android:layout_width="90dp"
        android:layout_height="100dp"
        android:onClick="button2"
        android:scaleType="centerCrop"
        android:src="@drawable/so2" />

    <ImageButton
        android:layout_width="90dp"
        android:layout_height="100dp"
        android:onClick="button3"
        android:scaleType="centerCrop"
        android:src="@drawable/so3" />

    <ImageButton
        android:layout_width="90dp"
        android:layout_height="100dp"
        android:onClick="cong"
        android:scaleType="centerCrop"
        android:src="@drawable/cong" />
</LinearLayout>

<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <ImageButton
        android:layout_width="90dp"
        android:layout_height="100dp"
        android:onClick="button4"
        android:scaleType="centerCrop"
        android:src="@drawable/so4" />

    <ImageButton
        android:layout_width="90dp"
        android:layout_height="100dp"
        android:onClick="button5"
        android:scaleType="centerCrop"
        android:src="@drawable/so5" />

    <ImageButton
        android:layout_width="90dp"
        android:layout_height="100dp"
        android:onClick="button6"
        android:scaleType="centerCrop"
        android:src="@drawable/so6" />

    <ImageButton
        android:layout_width="90dp"
        android:layout_height="100dp"
        android:onClick="tru"
        android:scaleType="centerCrop"
        android:src="@drawable/tru" />

</LinearLayout>

<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <ImageButton
        android:layout_width="90dp"
        android:layout_height="100dp"
        android:onClick="button7"
        android:scaleType="centerCrop"
        android:src="@drawable/so7" />

    <ImageButton
        android:layout_width="90dp"
        android:layout_height="100dp"
        android:onClick="button8"
        android:scaleType="centerCrop"
        android:src="@drawable/so8" />

    <ImageButton
        android:layout_width="90dp"
        android:layout_height="100dp"
        android:onClick="button9"
        android:scaleType="centerCrop"
        android:src="@drawable/so9" />

    <ImageButton
        android:layout_width="90dp"
        android:layout_height="100dp"
        android:onClick="nhan"
        android:scaleType="centerCrop"
        android:src="@drawable/nhan" />


</LinearLayout>

<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <ImageButton
        android:layout_width="90dp"
        android:layout_height="100dp"
        android:onClick="button7"
        android:scaleType="centerCrop"
        android:src="@drawable/so7" />

    <ImageButton
        android:layout_width="90dp"
        android:layout_height="100dp"
        android:onClick="button8"
        android:scaleType="centerCrop"
        android:src="@drawable/so8" />

    <ImageButton
        android:layout_width="90dp"
        android:layout_height="100dp"
        android:onClick="button9"
        android:scaleType="centerCrop"
        android:src="@drawable/bang" />

    <ImageButton
        android:layout_width="90dp"
        android:layout_height="100dp"
        android:onClick="chia"
        android:scaleType="centerCrop"
        android:src="@drawable/chia" />


</LinearLayout>

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center_horizontal"
        android:onClick="buttonReset"
        android:text="Khởi động lại" />
</LinearLayout>

23123.png1366x768 138 KB

code đây ạ:
package hn.bk.nguyenbaongoc.trangngoc;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends ActionBarActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

int a, b, x = 1;
String so1 = "";
String so2 = "";

public void button1(View view) {
    if (x == 1) {
        so1 = so1 + "1";
        hienThi();
    } else {
        so2 = so2 + "1";
        hienThi();
    }
}

public void button2(View view) {
    if (x == 1) {
        so1 = so1 + "2";
        hienThi();
    } else {
        so2 = so2 + "2";
        hienThi();
    }
}

public void button3(View view) {
    if (x == 1) {
        so1 = so1 + "3";
        hienThi();
    } else {
        so2 = so2 + "3";
        hienThi();
    }
}

public void button4(View view) {
    if (x == 1) {
        so1 = so1 + "4";
        hienThi();
    } else {
        so2 = so2 + "4";
        hienThi();
    }
}

public void button5(View view) {
    if (x == 1) {
        so1 = so1 + "5";
        hienThi();
    } else {
        so2 = so2 + "5";
        hienThi();
    }
}

public void button6(View view) {
    if (x == 1) {
        so1 = so1 + "6";
        hienThi();
    } else {
        so2 = so2 + "6";
        hienThi();
    }
}

public void button7(View view) {
    if (x == 1) {
        so1 = so1 + "7";
        hienThi();
    } else {
        so2 = so2 + "7";
        hienThi();
    }
}

public void button8(View view) {
    if (x == 1) {
        so1 = so1 + "8";
        hienThi();
    } else {
        so2 = so2 + "8";
        hienThi();
    }
}

public void button9(View view) {
    if (x == 1) {
        so1 = so1 + "9";
        hienThi();
    } else {
        so2 = so2 + "9";
        hienThi();
    }
}

public void button0(View view) {
    if (x == 1) {
        so1 = so1 + "0";
        hienThi();
    } else {
        so2 = so2 + "0";
        hienThi();
    }
}

public void buttonReset(View view) {
    so1 = "";
    so2 = "";
    x = 1;
    hienThi();
}

public void cong(View view) {
    a = Integer.parseInt(so1);
    x = 2;
}

public void tru(View view) {
    a = Integer.parseInt(so1);
    x = 3;
}

public void nhan(View view) {
    a = Integer.parseInt(so1);
    x = 4;
}

public void chia(View view) {
    a = Integer.parseInt(so1);
    x = 5;
}

public void bang(View view) {
    b = Integer.parseInt(so2);
    switch (x) {
        case 2:
            TextView hienThi1 = (TextView) findViewById(R.id.hienThi);
            int c = a + b;
            hienThi1.setText(String.valueOf(c));
            break;
        case 3:
            TextView hienThi2 = (TextView) findViewById(R.id.hienThi);
            c = a - b;
            hienThi2.setText(String.valueOf(c));
            break;
        case 4:
            TextView hienThi3 = (TextView) findViewById(R.id.hienThi);
            c = a * b;
            hienThi3.setText(String.valueOf(c));
            break;
        case 5:
            TextView hienThi4 = (TextView) findViewById(R.id.hienThi);
            c = a / b;
            hienThi4.setText(String.valueOf(c));
            break;
    }
}

public void xoa(View view) {
    if (x == 1) {
        so1 = so1.substring(0, so1.length() - 1);
        hienThi();
    } else {
        so2 = so2.substring(0, so2.length() - 1);
        hienThi();
    }
}

public void hienThi() {
    TextView hienThi1 = (TextView) findViewById(R.id.hienThi);
    if (x == 1) {
        hienThi1.setText(so1);
    } else {
        hienThi1.setText(so2);
    }
}

}