自定义toast

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public class MainActivity extends Activity implements OnClickListener {    Handler handler = new Handler();    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        findViewById(R.id.btnSimpleToast).setOnClickListener(this);        findViewById(R.id.btnSimpleToastWithCustomPosition).setOnClickListener(                this);        findViewById(R.id.btnSimpleToastWithImage).setOnClickListener(this);        findViewById(R.id.btnCustomToast).setOnClickListener(this);        findViewById(R.id.btnRunToastFromOtherThread).setOnClickListener(this);    }    public void showToast() {        handler.post(new Runnable() {            @Override            public void run() {                Toast.makeText(getApplicationContext(), "我来自其他线程！",                        Toast.LENGTH_SHORT).show();            }        });    }    @Override    public void onClick(View v) {        Toast toast = null;        switch (v.getId()) {        case R.id.btnSimpleToast:            Toast.makeText(getApplicationContext(), "默认Toast样式",                    Toast.LENGTH_SHORT).show();            break;        case R.id.btnSimpleToastWithCustomPosition:            toast = Toast.makeText(getApplicationContext(), "自定义位置Toast",                    Toast.LENGTH_LONG);            toast.setGravity(Gravity.CENTER, 0, 0);            toast.show();            break;        case R.id.btnSimpleToastWithImage:            toast = Toast.makeText(getApplicationContext(), "带图片的Toast",                    Toast.LENGTH_LONG);            toast.setGravity(Gravity.CENTER, 0, 0);            LinearLayout toastView = (LinearLayout) toast.getView();            ImageView imageCodeProject = new ImageView(getApplicationContext());            imageCodeProject.setImageResource(R.drawable.ic_launcher);            toastView.addView(imageCodeProject, 0);            toast.show();            break;        case R.id.btnCustomToast:            LayoutInflater inflater = getLayoutInflater();            View layout = inflater.inflate(R.layout.custom,                    (ViewGroup) findViewById(R.id.llToast));            ImageView image = (ImageView) layout                    .findViewById(R.id.tvImageToast);            image.setImageResource(R.drawable.ic_launcher);            TextView title = (TextView) layout.findViewById(R.id.tvTitleToast);            title.setText("Attention");            TextView text = (TextView) layout.findViewById(R.id.tvTextToast);            text.setText("完全自定义Toast");            toast = new Toast(getApplicationContext());            toast.setGravity(Gravity.RIGHT | Gravity.TOP, 12, 40);            toast.setDuration(Toast.LENGTH_LONG);            toast.setView(layout);            toast.show();            break;        case R.id.btnRunToastFromOtherThread:            new Thread(new Runnable() {                public void run() {                    showToast();                }            }).start();            break;        }    }}
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